Indeed, LED (light emitting diode) lighting does seem to be the wave of the future right now, given the mercury content and light quality issues with the current king-of-the-hill of green bulbs, the compact fluorescent (CFL). LEDs use significantly less energy than even CFLs, and do not contain mercury. And they are becoming economically competitive with CFLs at the point of purchase while yielding superior quality lighting and energy bill savings down the line.
But LEDs do have a dark side. A study published in late 2010 in the journal Environmental Science and Technology found that LEDs contain lead, arsenic and a dozen other potentially dangerous substances. LEDs are touted as the next generation of lighting,” says Oladele Ogunseitan, one of the researchers behind the study and chair of the University of California (UC)-Irvine’s Department of Population Health & Disease Prevention.
This is not the first time energy-saving bulbs have been criticised – fluorescent bulbs emit dangerous UV light. Eco-friendly LED lights may damage your eyes, according to new research.A study has discovered that exposure to LED lights can cause irreparable harm to the retina of the human eye.
Here are some disadvantages of LED lights
Blue hazard: There is a concern that blue LEDs and cool-white LEDs are now capable of exceeding safe limits of the so-called blue-light hazard as defined in eye safety specifications.
Light quality: Most cool-white LEDs have spectra that differ significantly from a black body radiator like the sun or an incandescent light. The spike at 460 nm and dip at 500 nm can cause the color of objects to be perceived differently under cool-white LED illumination than sunlight or incandescent sources, due to metamerism, red surfaces being rendered particularly badly by typical phosphor-based cool-white LEDs. However, the color rendering properties of common fluorescent lamps are often inferior to what is now available in state-of-art white LEDs.
Temperature dependence: LED performance largely depends on the ambient temperature of the operating environment. Over-driving the LED in high ambient temperatures may result in overheating of the LED package, eventually leading to device failure. Adequate heat-sinking is required to maintain long life. This is especially important when considering automotive, medical, and military applications where the device must operate over a large range of temperatures, and is required to have a low failure rate.
Blue pollution: Because cool-white LEDs (i.e., LEDs with high color temperature) emit proportionally more blue light than conventional outdoor light sources such as high-pressure sodium lamps, the strong wavelength dependence of Rayleigh scattering means that cool-white LEDs can cause more light pollution than other light sources. The International Dark-Sky Association discourages the use of white light sources with correlated color temperature above 3,000 K.
Voltage sensitivity: LEDs must be supplied with the voltage above the threshold and a current below the rating. This can involve series resistors or current-regulated power supplies.
High initial price: LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than most conventional lighting technologies. The additional expense partially stems from the relatively low lumen output and the drive circuitry and power supplies needed.
Area light source: LEDs do not approximate a “point source” of light, but rather a Lambertian distribution. So LEDs are difficult to use in applications requiring a spherical light field. LEDs are not capable of providing divergence below a few degrees. This is contrasted with lasers, which can produce beams with divergences of 0.2 degrees or less.
Are led lights harmful to eyes?
Dr Alexander Wunsch in his work linked below states that blue light “penetrates the healthy eye down to the retina and causes oxidation stress.”
Most LED lightening commercially available has the bluish dominant.
Does it mean that we are globally changing healthy artificial light on the adverse for our eyes one?
I’d submitted few years ago a proposal of research project concerning necessity to study adverse effects of LED lightening on our roads. It was rejected then. Possibly it would be worth to re-open it at least as the RG project for the beginning?
Would anybody be interested in co-operation in such Project? After suitable further development It could be re-submitted to some EU R&D program.
How To Protect Your Eyes From The Harm Of Blue LED Light
Reduce Screen Time
Try to decrease the amount of time spent in front of these screens and take frequent breaks to give your eyes a rest. Avoid screen time 2-3 hours before going to bed; if you can’t do so:
Screen filters are available for smart phones, tablets, and computer screens. They decrease the amount of blue light given off from these devices that could reach the retina in our eyes. Night Shift for Mac OS, and Blue Light mode for Windows 10 are two such. iOS has its own version of Night Shift. Many builds of Android also include such filters and for those that lack them, apps like Twilight provide similar functionality.
Use Computer Glasses Or Anti-Reflective Lenses
Computer glasses with yellow-tinted lenses that block blue light can help ease computer digital eye strain by increasing contrast. Anti-reflective lenses reduce glare and increase contrast and also block blue light from the sun and digital devices.
Are led lights harmful to skin?
according to the studies and tests from some laboratories, LED lights are not harmful to people’s skin. LED lights are eco-friendly and clean light sources that virtually do not lead to any UV radiations. The high quality LED lights are very significant to ensure the safety and health. There are some lighting standards created to ensure the safety of led light fixtures such as IECPEN 60825 which is issued in Europe. So it does matter about how to select and use the high quality led lights.
Do led lights cause headaches?
But because LED flickering is even more pronounced, with the light dimming by 100% rather than the roughly 35% of fluorescent lamps, there’s a chance that LEDs could be even more likely to cause headaches. … Another solution is to design the lights so that the flicker can’t be detected.
Is led light good for reading?
Use LEDs. It’s the best lighting technology so far and it doesn’t emit UV light, neither does it need some warm-up time before it is able to produce its full brightness unlike CFLs. Its beautiful light is also consistent, unlike the light from traditional bulbs that eventually dims.
They are bright and have really great color rendering (the quality of the light).
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